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WAEC Further Mathematics 2006 Question 36

Question 36

Dynamics

A lift moving upwards with a uniform acceleration of 5ms−2, carries a body of mass p kg. If the reaction on the floor is 480 N, find the value of p. (take g = 10ms−2)

  1. A.32
  2. B.36
  3. C.48
  4. D.64
Show the answer and explanation

Answer: A (32)

Explanation

For upward acceleration, R − pg = pa, so R = p(g + a). 480 = 15p, giving p = 32.